What other ways can organisms be classified? (20 points!!)

Other ways that organisms can be classified is by grouping organisms by their evolutionary history which could be traits that have changed over time and other species that have a common ancestor. You could also use a branching tree diagram.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.